package com.example.springbootdemo.utils;

import org.apache.commons.lang.StringUtils;

import javax.servlet.http.HttpServletRequest;

public class WebUtil {
    /**
     * 获取到请求头中uid的值
     * @param request
     * @return
     */
    public static Long getUid(HttpServletRequest request){
        String uid = request.getHeader("uid");
        if(StringUtils.isNotBlank(uid)){
            Long value;
            try {
                value = Long.valueOf(uid);
            }catch (Exception e){
                value = null;
            }
            return value;
        }
        return null;
    }
    /**
     * 获取到请求头中Token的值
     * @param request
     * @return
     */
    public static String getToken(HttpServletRequest request){
        return request.getHeader("Token");
    }

    /**
     * 获取到ip
     * @param request
     * @return
     */
    public static String getIp(HttpServletRequest request){
        //X-Forwarded-For：Squid 服务代理
        String ipAddresses = request.getHeader("X-Forwarded-For");

        if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
            //Proxy-Client-IP：apache 服务代理
            ipAddresses = request.getHeader("Proxy-Client-IP");
        }

        if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
            //WL-Proxy-Client-IP：weblogic 服务代理
            ipAddresses = request.getHeader("WL-Proxy-Client-IP");
        }

        if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
            //HTTP_CLIENT_IP：有些代理服务器
            ipAddresses = request.getHeader("HTTP_CLIENT_IP");
        }

        if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
            //X-Real-IP：nginx服务代理
            ipAddresses = request.getHeader("X-Real-IP");
        }
        String ip = null;
        //有些网络通过多层代理，那么获取到的ip就会有多个，一般都是通过逗号（,）分割开来，并且第一个ip为客户端的真实IP
        if (ipAddresses != null && ipAddresses.length() != 0) {
            ip = ipAddresses.split(",")[0];
        }

        //还是不能获取到，最后再通过request.getRemoteAddr();获取
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
            ip = request.getRemoteAddr();
        }

        // ip配置
        if (ip.equals("127.0.0.1") || ip.endsWith("0:0:0:0:0:0:1")) {
            // 根据网卡取本机配置的IP
            return "127.0.0.1";
        }
        return ip;
    }
}
